Tips for keeping 35mm negatives dust and scratch free

Can you please give me tips to keep my 35mm negatives clean, and dust/scratch free during the processing, developing and printing stages. I take great care, but I still end up with scratchs and dust ususally - often this can be fixed by simply whipping the negative with lint-free lens tissues prior to print developing - but more than often it is hard to remove all scratchs. So any tips about any related processor for keeping clean negs would be greatly appreciated :)

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