Here's my current project - an ivory Princess phone working its way back to white... Will be glad when we get some direct sun and warmer weather... It's been through 2 3-hour treatments with Salon Creme 40; hopefully we'll get a sunny day next week to finish it off.
The white 2500 is one I just finished refurbishing - replaced the Touch Tone pad (first column and row are being finicky - will clean in the future...) with a NOS 72H3A pad (appropriate for the 86 plastics from the 91 refurb), cleaned off a couple of stickers, but had nice white plastics.
To me, nothing beats the crispness of a clean white Western Electric phone, be it a 2500 desk set or a 554 wall phone, Trimline, or Princess. Now to find a white 500 for the next project!
Jim
Pics 1&2 are before
Pic 3 is mid process