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 Post subject: White film on knobs and push buttons
PostPosted: Mar Sun 28, 2021 6:48 pm 
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Joined: Jan Wed 23, 2013 4:16 pm
Posts: 2388
Location: Central Florida, 32765
I'm trying to clean up a few radios I picked up at the flea market and can't seem to get some type of white film off the knobs and push buttons. Any suggestions? Thanks.

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Joe
Seriously, what's the worst that could happen?


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 Post subject: Re: White film on knobs and push buttons
PostPosted: Mar Sun 28, 2021 7:10 pm 
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Joined: Apr Sun 01, 2012 9:55 pm
Posts: 13024
Location: Seattle, WA
What material are they, and what kind of finish do they have on them?

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Measure it with a micrometer, mark it with chalk, cut it with a chainsaw.


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 Post subject: Re: White film on knobs and push buttons
PostPosted: Mar Sun 28, 2021 7:34 pm 
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Joined: Jan Wed 23, 2013 4:16 pm
Posts: 2388
Location: Central Florida, 32765
Hi Rodney. The ones I'd really like to clean up are the push buttons from a Transoceanic. The others are just plastic knobs from a couple of AA5's. Thanks.

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Joe
Seriously, what's the worst that could happen?


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 Post subject: Re: White film on knobs and push buttons
PostPosted: Mar Sun 28, 2021 8:24 pm 
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Joined: Jun Sat 15, 2019 7:43 pm
Posts: 1433
It is the plastic outgassing as it breaks down. Any cleaner like 409 will take it off.

DM


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 Post subject: Re: White film on knobs and push buttons
PostPosted: Mar Mon 29, 2021 3:30 pm 
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Joined: May Sun 06, 2007 2:52 am
Posts: 2809
I just restored a Transoceanic myself and all the knobs and p.buttons were heavily crusted with that white crap.I soaked them all in a mixture of dishwashing soap and Windex and scrubbed with a toothbrush.


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 Post subject: Re: White film on knobs and push buttons
PostPosted: Mar Mon 29, 2021 11:37 pm 
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Joined: Nov Fri 10, 2006 12:24 am
Posts: 3015
Location: Thornhill, Ontario, Canada
Nearly all old Heathkit preamps have white deposits on the knobs. It will clean off easily, but it appears to come back! I presume it comes out of the plastic. I just clean it off each time!
Cheers,
Roger

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Thornhill, Ontario
Ontario Vintage Radio Assoc. http://www.ovra.ca


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 Post subject: Re: White film on knobs and push buttons
PostPosted: Mar Wed 31, 2021 5:04 am 
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Joined: Oct Wed 14, 2009 6:36 am
Posts: 6550
Location: New York USA
I used LAs Awesome Cleaner from the dollar store on my Heathkit, the knobs look like new. Sold everywhere
https://www.dollargeneral.com/products/ ... eaner.html


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 Post subject: Re: White film on knobs and push buttons
PostPosted: Apr Fri 09, 2021 3:45 am 
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Joined: Jan Sat 23, 2021 10:21 pm
Posts: 15
Location: Grafton, Ontario Canada
Also experienced white residue on Heathkit knobs. 2 minutes in Isopropyl Alcohol using ultrasonic cleaner, absolutely no scrubbing and looks like new. A bit of Brasso to polish the centre.

Jim


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 Post subject: Re: White film on knobs and push buttons
PostPosted: Apr Fri 09, 2021 2:28 pm 
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Joined: Apr Wed 24, 2013 10:08 pm
Posts: 1486
Location: Highland & Livonia, MI
I'm guessing it might be mold. I had a couple mold events in my new home and it seemed to show up on the radio knobs. I don't have a/c. I've since added a couple dehumidifiers in the home.


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 Post subject: Re: White film on knobs and push buttons
PostPosted: Apr Fri 09, 2021 9:59 pm 
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Joined: Dec Tue 23, 2014 6:51 pm
Posts: 2318
Location: N. Palm Bch, Fl.
I tried different cleaners, but was never real happy with the results. I have a clean set of buttons that are Pre H500 you can have if the cleaning doesn't work well.

Freeman


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