The solar panels on some of these proves get covered by dust and eventually no longer get enough sunshine to run. You could hover little fliers like this over those probes and blow the dust off!
Martian leaf blower
Maybe! I saw a close-up of Ingenuity as it did a spin-up but, ironically, saw no dust being blown up from the surface. The Martian atmosphere is extremely thin and that may account for my not noticing any movement. But perhaps some is being blown around. Enough to do what you suggest. Good idea!