Asked on 01 May 2020
If possible, will be wearing a mask and observing social distancing
Same problem! Generally, there is no restriction on washing your car so long as you observe the current circuit breaker measures, e.g. wearing a mask when outside.
However, I'm not sure how feasible it will be to wash your car with a mask on (e.g. may be tiring and difficult to breathe).
Alternatively, you may consider sending it to the nearby car wash (though I don't usually do it for my own car; but well, some sacrifices here and there).