Beware cheap coverslips - how to clean glass!

Just bought some cheap coverslips from ebay (from xxxtools)
Though in sealed packing, they are of dreadful quality and are covered
with some sort of residue. Beware! Will be buying branded next time.
Also, has anyone any good recipes for cleaning slides and slips?
I like 50% IPA, 5% Ammonia 45% deionised water, personally.
HJ










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