Ultrasonic Cleaning Science

Yesterday, I pulled the trigger and bought a GT Sonic 2L ultrasonic cleaner, 50W with a 100W heater.

The aim of this post is to highlight the successes and failures I've exhibited when using the cleaner.

Some key points:

    Ultrasonic cleaners are noisy, please consider your neighbours :roll:
    Metal baskets can damage items; I created a kevlar basket liner after test 3
    Spoiler:
    Image
    ABS shouldn't be heated too high; 40degC is ample
    Exercise caution if ultrasonically cleaning old (particularly coloured) items; see test 3
    Ultrasonic cleaning will restore texture where possible but cannot reverse shine
    After cleaning using an ultrasonic cleaner, ensure that you wash your items down with plain water (some advise de-isonised or reverse osmosis water though I use tap water) and dry them thoroughly


Test One - AT102W Caps

Article(s): AT102W pad printed ABS Alps keycap set
Conditions: One bath at 8 minutes, 40degC, 1 part Dentural denture cleaning solution to 10-12 parts ordinary water
Result: Caution!
Spoiler:
Pad printed legends may be damaged by prolonged ultrasonic cleaning. Hand washing is advised else keep the time spent in the ultrasonic cleaner to a minimum.

Evidence:
Spoiler:
ImageImage


Test Two - IBM 5140 Caps

Article(s): IBM 5140 dye-sub PBT Alps keycap set
Conditions: One bath at 8 minutes, 40degC, 1 part Dentural denture cleaning solution to 10-12 parts ordinary water
Result: Success!
Evidence:
Spoiler:
No before and afters. Sorry!


Test Three - Old PBT, Engraved Caps

Article(s): Various 25 year-old PBT, engraved keycaps
Conditions: One bath at 8 minutes, 40degC, 1 part Dentural denture cleaning solution to 10-12 parts ordinary water
Result: Failed!
Spoiler:
There were white artefacts on the red keycaps within this set. Other users have reported issues with ultrasonically cleaning much older caps (such as typewriter keycaps). It won't rub off, leading me to believe it's bleached like an old, red car in the sun. The engraving has faded on some caps and the off-white caps were bleached white too.

This test was repeated without the Dentural denture cleaning solution and the same results were exhibited.

Damage (chips and scratches) to the keycaps was also observed from contact with the metal basket.

I would consider hand cleaning considerably old keycap sets.

Evidence:
Spoiler:
Image


Test Four - HEU292 Keycaps

Article(s): HEU292 doubleshot ABS Alps keycap set
Conditions: Two 5-minute baths at 20degC with a stir in between, 1 part Dentural denture cleaning solution to 10-12 parts ordinary water
Result: Success!
Evidence:
Spoiler:
ImageImage


Test Five - Orange Alps Switches (Partial)

Article(s): 5 worn orange Alps top housings and sliders
Conditions: One bath at 6 minutes, 20degC, 1 part Dentural denture cleaning solution to 10-12 parts ordinary water
Result: Success!
Spoiler:
After cleaning the top housings and sliders, the slider was lubed using a small amount of Super Lube multi-purpose synthetic oil with PTFE all the way around. The switches were reassembled and a 1u M0116 cap was placed on both a cleaned switch and uncleaned switch.

The cleaned switches are much less grainy on the downstroke and the upstroke is very fluid. On the uncleaned switches, the upstroke is almost in 3 separate parts, making it feel awfully jagged.

As the evidence shows, some of the sliders are permanently marked and will struggle to achieve the performance of 'NOS' switches although this ultrasonic cleaning process has definitely helped.

Evidence:
Spoiler:
ImageImage


Test Six - Orange Alps Switches (Complete)

Article(s): 26 worn orange Alps, all components
Conditions: One bath at 6 minutes, 20degC, 1 part Dentural denture cleaning solution to 10-12 parts ordinary water
Result: Success!
Spoiler:
After cleaning the switches which had been split in to loose components, the slider was lubed using a small amount of Super Lube multi-purpose synthetic oil with PTFE all the way around. The switches were reassembled and a 1u M0116 cap was placed on both a fully cleaned switch and switch with a cleaned bottom housing and slider.

The difference between the two switches truly is negligible however, with the switches apart anywho, it's perhaps worth cleaning all of the components.

Evidence:
Spoiler:
As above, really!
Last edited by pizza_is_a_lie on 13 Oct 2018, 20:59, edited 10 times in total.
pizza_is_a_lie
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Unread post13 Oct 2018, 00:32

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This is interesting - I don't have an US cleaner but I always supposed this was a safe way to clean things (short of putting bleach, etc. in the solution). I'm at somewhat of a loss to understand, unless somehow the red was a very superficial dye - and it doesn't sound like that is the case.

Has anyone else observed something like this ?
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Unread post13 Oct 2018, 04:11

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pizza_is_a_lie wrote:Yep, another ultrasonic cleaning post!
it's a similar symptom to that of old, red cars.

The only issue with my old red car is the clearcoat giving out after 20 years. :lol:

But seriously, I've found anything aggressive on old colored caps is a complete crapshoot. Warm water and Dawn dish soap is as far as I'll go with anything like that anymore. A couple hour soak then a toothbrush scrub gets them squeaky clean anyhow.
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Unread post13 Oct 2018, 04:33

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I used ultrasonic cleaner with a bit of dish soap in hot water on black, blue and green keycaps. All keycaps were ABS. No problems.
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Unread post13 Oct 2018, 09:58

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Sangdrax wrote:
pizza_is_a_lie wrote:Yep, another ultrasonic cleaning post!
it's a similar symptom to that of old, red cars.

The only issue with my old red car is the clearcoat giving out after 20 years. :lol:

But seriously, I've found anything aggressive on old colored caps is a complete crapshoot. Warm water and Dawn dish soap is as far as I'll go with anything like that anymore. A couple hour soak then a toothbrush scrub gets them squeaky clean anyhow.

I totally agree. Old, red caps are not served well in an ultrasonic cleaner. That said, the off-white caps in this same set are now bleached white. It may be the manufacturing or dyeing technique used, I wouldn't be sure.

However, what I need to make perfectly clear is that anything else I've thrown in the ultrasonic cleaner has been absolutely fine.

Yesterday, the PBT 5140 caps and ABS AT102W caps were fine and cleaned up wonderfully.

Today, I'm in the process of ultrasonically cleaning some HEU292 doubleshot ABS Alps keycaps.

I've updated the OP to illustrate my tests :mrgreen:
Last edited by pizza_is_a_lie on 13 Oct 2018, 17:09, edited 1 time in total.
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Unread post13 Oct 2018, 15:21

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vvp wrote:I used ultrasonic cleaner with a bit of dish soap in hot water on black, blue and green keycaps. All keycaps were ABS. No problems.

Worth mentioning that the green, blue and yellow keycaps were not bleached or damaged, just the red and off-white.
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Unread post13 Oct 2018, 16:23

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Thanks for posting! I'd be curious to see whether or not the older keycaps still got the same results if you hadn't used the denture cleaning solution. Were the other colored caps also just dyed, or was the plastic colored all the way through?
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Unread post13 Oct 2018, 18:59

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snufflecat wrote:Thanks for posting! I'd be curious to see whether or not the older keycaps still got the same results if you hadn't used the denture cleaning solution. Were the other colored caps also just dyed, or was the plastic colored all the way through?

Hey Snuffle,

Yep - same results without the cleaning solution. I assumed that it may have been the 1.5% of sodium hypochlorite but clearly not. This was in a clean bath, too.

I've just cut the keycaps open. I don't see anything notable about why it would be bleaching but reds throughout time have always suffered AFAIK.

Spoiler:
ImageImage
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Unread post13 Oct 2018, 19:27

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