My fiance brought home a doll house the neighbor was trashing. It was badly beaten and abused and had definitely seen better days, but we could fix it. We decided to give it an overhaul and gift it to her best friends daughter.
Step 1: Dis-assembly
Step 2: Clean, Scrape and Sand
The pieces you are replacing do not need to be sanded, just set them aside for now.
A glue scraper works well to get the "extra" stickers from thru-ought the years. after you get the stickers off, wipe it down with a damp, slightly soapy wash cloth. You may be able to skip this step depending on how dirty it is.
Then after they are scraped, wiped and dry, Its time to sand. I went straight to 220 grit. This is to scuff the surface and prep for new paint.
Step 3: Prime the Walls
There isn't much to the instructions here, just paint them and let them dry...
Step 4: Replace the Floor
Then mark the new pieces and find their old counterpart. Lay the old one on top of the new floor and trace the floor-plan as needed.
I used my band-saw for these odd cuts.
I replaced ALL pieces that were 1/8"MDF