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The problem is the thinner you’re using to wash off the excess is too strong. Probably also too strong for thinning the enamel paint. Then when you are applying the wash this may start to dissolve the clear coat already…. Then by using the thinner to wash the excess you’re taking away all clear coat that wasn’t dissolved and also the paint. Real thinner is used in the automotive industry to thin lacquer based paints. These are one of the toughest paints as you may know. Real thinner also dissolves plastics, even ABS.
I made the same mistake a few months back. Because in my case of the language barrier…. I didn’t know that a ‘thinner’ in English is a ‘thinning agent’ translated so to say. So I used a real thinner, not a thinning agent. I’m thinking this is also where you made a mistake.
A pro builder in Holland told me to start out with a light as possible agent to thin the paint. If it’s good enough to thin the paint, it’s good enough to clean the brushes and wipe off the excess paint.
Roughly translated I use a “wash benzene”. For enamels it works great.
Some use lighter fluid or white spirit.
If you are not sure of what to use, I would suggest spraying some clear coat on a empty runner. Then use a cotton ear butt damped in a mild thinning agent which also thins your enamels properly and wipe it over the clear coat. If it’s safe to use you won’t see anything happen. If it’s too strong you’ll see the clear coat dissolve or being completely wiped off.
If you try it this way you won’t risk damaging your precious paint job.
Hope this helps you out

Are you using an Acrylic gloss?

Also, don’t use a semi gloss if you’re going to do panel washing, use a full gloss. You want that top coat to be as smooth as possible to let the wash flow quicker and more freely. this will also aid in the clean up. I would also suggest that you give the top coat time to cure. While you only need to wait for it to dry, it’s best that you let it cure. try waiting a day after you apply the clear coat before you do the wash. might just fix your problem. As long as your using an acrylic gloss, and you give it ample time to cure completely, you shouldn’t have an issue. Other then that, you might try to find a different type of thinner. Try looking into Tamiya’s thinners.