A good dehuidifier is a good investyment for your paint room. One trick I have used in the past is a very fine broad, low pressure mist of clean thinner shot over the affected area. Dont over do it if you have already shot your trim colors.

My Thirteen Old Time turned almost white when I put what I thought was goint to be the final coat of clear.   Finally the real last coat was put on whe the temps were in the 60's,  night time,  no wind,  using a paint brush(no spray) outside my basement.   After clean up I looked at the plane, still outside, and the transparent covering looked great.    I have had some models I just went ahead and flew.  Guess the sun and rubbing the oil off the planes, the blush disappeared.