This is pretty common in manufacturing facilities. If your coolant dries on the parts, say over a weekend, what you have to do is get them wet again. Get them wet in the same amount of coolant as you’re trying to wash off and then you put the parts in the vacuum degreaser. The dried-on coolant breaks free when you re-hydrate them and then you can put it through the vacuum degreaser. We have seen success using this procedure a number of times