# Contact cleaner

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#### pulzar

##### New Member
What is the best contact cleaner?

I've used the following:
• real contact cleaner (didn't do so well as I reclled)
• WD-40 worked quite well but probably not good for higher voltage contacts; does leave a residue.
• silicon spray - mixed results (that stuff goes everywhere)
• carburetor cleaner (some leave no residue and others leave a mess so brand probably matters)

Anyone have any experience and/or recommendations?

Gary
KTX5JG

#### Chippie

##### Member
Servisol or Electrolube, here in the UK

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#### HiTech

##### Well-Known Member
I second the DeOxit ..... been using it for many years with excellent results. It really is superior stuff.

#### SODA

##### Member
A good way to clean contacts is to use a simple rubber eraser. Those the kids use in school.

soda

#### pulzar

##### New Member
I'm really concerned with multi-contact wafer switches like those buried on oscilloscopes!

Gary

#### Nigel Goodwin

##### Super Moderator
I've been using Servisol Super40 (WD40 clone) for 20+ years now, far better than any contact or switch cleaner I've ever tried.

The whole point is that it leaves a residue, contact cleaner removes the switches (or potentiometers) original lubrication, the lubricating residue of WD40 replaces it.

#### HiTech

##### Well-Known Member
Not to intentionally rain on what Nigel states, but to reaffirm using DeOxit, especially now that you mention that particular switch. You don't want to revisit that issue again. DeOxit will effectively deoxidize and leave a permanent oil/film on those contacts.... I've restored controls that were so bad I thought they would require replacement. DeOxit saved the day many times, especially on those specialty parts that are no longer available. It's thin enough that it will work its way into so called "sealed" controls. It also meets military spec for use underwater in subs and missles.... can't get much better than that! Well maybe they could give it a nice minty odor instead of the pungent smell it has!

#### HiTech

##### Well-Known Member
My work i look after 30 odd TV Station Broadcast ENG cameras. (P2 Panasonic rigs and a few Sony SX).... They have diecast magnesium bodies and in all machines the edge where body cover meats main body there's always a pile of white corrosion from the activity leftover from the usual rain splash days .....
Do those covers have wire-braided, rubber seals on them? I know that many field/ENG cameras do. I think the braid is stainless steel and being iron based against an alloy of magnesiou/aluminum, it creates a potential that is exacerbated when water (esp. mineralized water) comes in contact. I could understand why applying an petro-based deoxidant would retard corrosion.

#### peterb2

##### New Member
Do those covers have wire-braided, rubber seals on them? I know that many field/ENG cameras do. I think the braid is stainless steel and being iron based against an alloy of magnesiou/aluminum, it creates a potential that is exacerbated when water (esp. mineralized water) comes in contact. I could understand why applying an petro-based deoxidant would retard corrosion.

Yes, you're onto it! These cameras have precisely that kind of electrical connect probably as a requirement for RF screening (probably under EMC directive) but it truly can result in a really bad mess.

One company suggested I could try using a thin wipe of mineral grease but most certainly not a lithium based one as with the magnesium it would really make for other problems.

As i've said, the best results i've had in removing the corrosion products and to keep them at bay has been with Graig Deoxit (the concentrated version.... NOT the one in aerosol spray form)....

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