I know I said I don't wash mine, but I actually use Castrol Biotrans QB truck wash.
A mate is an agronomist in the Sth Oz Riverland, and they've run exhaustive tests on dripper irrigation cleaners and found that Biotrans cleaned better than anything else trialled.
It didn't affect O rings, seals, pump seals, etc. and is food industry approved.
Apparently it really surprised the boffins from Castrol, as to them it's just a biodegradable truck wash !
It might also do what CT18 does, not sure.




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) turbo, p/steer, RFSV front axle/trutrack, HF, gullwing windows, double jerrys etc.
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