How to remove patch of paint for rework?

I use 1000 grit.  I have even used 600 grit very lightly.

I'd recommend using very fine sanding sticks or pads...like 3600-12000 grit. Lightly and gently sand away the top layers of paint.  Its a bit time consuming but it gives you more control over how much paint gets removed.

Even Windex may remove sereral layers of paint.

Will do! Thanks

Try Windex.