Nobody buys pure ethylene glycol for their radiators. Since we are talking about coolant, commercial coolant is what is relevant, not pure ethylene glycol.
Just wash it off, if you wet the dried coolant it's no long dry and will wash off, and as stated earlier your not going to hurt the battery, electrical, radiator, or the engine and any lingering moisture will be gone in nothing flat when you run it.
You run the engine to burp any air out of it.