the only times i found it redundant, or even a a furthar pollutant, was in dreams of negative pressure.. in those dreams, one is faced with wondering just what it is they are removing; and if acetone might furthar pollute something that is already shiny. if you aren't using lab-grade regents, at some point, cleaning efforts are suspects for more pollution.
solvent pollutants, otc, can soon bee a consideration on the road to purity.
you will know if and when this occurs, assuming a pristine reference point.
much as i should bee want to diss osmium;
the post rxn; pre-based , aqueous solution NP wash is the oft missed step in this show.
get rid of the shit earlier down the road, when it easy.
why do it later on?
still, water alone will do all you hope for. and water will wash crud off the re-chrystalized funky go-go.
you don't need anything else.