yeah if they've been squeeling a lot and the rotors or pads a glossy you need to dust up the rotors and pads a bit. Use some wet n dry paper to take the gloss off, then rinse with brake cleaner spray.
The copper grease works well for me. Worked on both RB74 pads and Ultimates.
I've rekitted my front calipers and the seals OK from the grease use, but obviously it's going to damage them a little bit.