I'll pop my Works Hydroshot portable pressure washer in my boot along with a spare battery.
If circumstances permit at Subway or somewhere before we arrive, I could jet maybe a dozen sets of rims. If your rims have a fresh coat of wax/sealant, I'll be able to jet off any brake dust you accumulate en route with a touchless rinse.
Only thing is I can't carry that much water in my boot
So if you bring 2 X 2 litre bottles of water I'll gladly rinse your rims if there's a chance