I have always used a squeegee on my 35mm and 120 films in conjunction with a little bit of wetting agent and a Paterson in line water filter.
Ask yourself the question - where is this grit/scale which causes the problems to come from - most likely the water supply - so if you filter it for sand/grit/scale that we all get in out water supplies from time to time - you should be OK.
In 40+ years of squeegeeing films I have never had a scratched negative.
I also dry my film in a film drying tent complete with air filter.
Martin
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