We started off with a GFgrill, it was fine for cleaning if it was still warm, then I saw an Anthony Worral Thompson one with removable plates, great, I thought (as it was myself who always ended up cleaning the GF grill) I can stick this in the dishwasher.
So I gave the GF to my son who was moving into a flat, but the AWT grill plates soon deteriorated with getting put in the dishwasher & sadly packed up altogether not long after.
We now have another GF grill, I always wipe the grill plates with a little oil/marg before cooking anything, wipe off most residue with kitchen paper, then more or less perch it over the washing up bowl & rinse off with soapy water.
My conclusion is best using one without the removable plates. If you are watching the weight...they're great