just an idea.....
to avoid elec problems while rinsing off cleaner would it not make sense to have the engine running to avoid standing water and then ,maybe,take it for a quick spin?
'95 s500 (bought for wife but can't bear to share!!!) 125kms
'92 legend 180kms
'88 tbirdturbo(fantastic car-only regular maint.)120kms
'87 mustang gt(gone)
'85 mustang gt(gone-but not forgotten)