Grab your old thick polish

Remove the brush.. Yeah it looks gross :/

Grab your remover or thinner. Thinner is preferred so you don't get bubbles in your polish.

Pour about a teaspoon in the polish.

While the remover sets in grab a cosmetic sponge.

Wipe off your brush :)

Now wipe off the top.. It will be nasty :)

I even took a tooth pick to the crevices.. And this is what I removed..

Place the brush back in the polish