[samakijoe]

I came across this video and I would guess it would clean clutch
fluid tank as well. Read comments for chemicals used.

 

[ghnl]

The end result looks great! I often use dishwasher detergent to clean plastic parts. Seems to work well and be safe to use. Another tip is to dump some crushed ice into the reservoir and agitate it (shake it - not yell insults at it...). The sharp edges of the crushed ice help scour out the crud without adversely affecting the plastic. Follow that with some hot soapy water and the ice & crud are easily rinsed away.

 

[Swampdweller]

The end result looks great! I often use dishwasher detergent to clean plastic parts. Seems to work well and be safe to use. Another tip is to dump some crushed ice into the reservoir and agitate it (shake it - not yell insults at it...). The sharp edges of the crushed ice help scour out the crud without adversely affecting the plastic. Follow that with some hot soapy water and the ice & crud are easily rinsed away.

Same principle with a twist. I used hot water, Dawn, a pocketful of loose change, and a whole lotta shakin'. Worked great -- the change didn't melt and need to be replaced.

 

[Tom&RobsAlfas]

Wouldn't use the change if I were you. The metal could damage the plastic tank and with my luck I'd get a dime stuck and not be able to get it out. The ice will melt and the water will dry.

 

[Swampdweller]

Wouldn't use the change if I were you. The metal could damage the plastic tank and with my luck I'd get a dime stuck and not be able to get it out. The ice will melt and the water will dry.

Yeah, I considered that when I was puzzling out what to do. My particular tank was loaded with (and I mean couldn't see through) that nasty oil/coolant emulsion from a long ago gasket leak. I tried the ice solution, which would work for less-scummy tanks, to no avail. So I figured if the coins were going to damage the tank, it was probably too brittle to be trusted anyway.

 

[samakijoe]

I came across this cleaner. Works great on ovens / barbecue etc...
Says it's safe for plastic. Did not try it on fluid tank as they are clean.
Don't let it touch your paint or aluminum other then that it great.
Crazy strong stuff...
Be interested to hear if anybody uses it...

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[autobroker]

Use Sulphamic acid. It's basically grout remover for the home. Custom Building Products Aqua Mix 1 lb. Sulfamic Acid Crystals 050231 - The Home Depot

Another option is to use radiator flush.

Tip: Always use strong rubber gloves when using chemicals!