Like a long range Ingenuity helicopter that cruised the planet using its downwash to revive old rovers ?

This idea gets brought up in every thread about Insight's dust issues - there is not enough air pressure on Mars for the downwash to clean the panels. For Ingenuity specifically the problem is that it is also far too far away - it would take over ten years for the chopper to reach Insight.

After a few months I can't even blow all the dust off surfaces in my apartment. I can only imagine years outside on Mars.

Don't underestimate the size of a planet

IIRC this was a plot point in The Martian

Oh, yes indeed. I forgot about that.

It might be fun to try, but realistically, without heat, thermo issues will ensure that even if you did this the rovers wouldn't work anymore.