T-cut is excellent with paint - I partially restored a vintage white Raleigh frame for a friend and it made the white look like new - just cuts off all the light marks and scuffs and staining. But you should always test an area first for colour fastness, and also the decals. I've never had a problem, and you're only talking about microns its removing. Only be concerned if your cloth starts turning completely the colour of the frame!
Then, typically, I give it a wax with automotive Autoglym deep shine wax, and it fends of the dirt and grime for a good while whilst looking stunningly shiny. Works even on a ratty frame....
Also, fyi, for plastics and rubbers, Meguiars trim detailer will revive dull plastics to like new. Careful on tyres though, it will make contact surfaces slippy...
1993 Kona Hahanna 14" "The Beast" in two tone red/silver
1993 Kona Hahanna 14" - the CHROME project (don't ask. But it will be pretty)
1998 Kona Hahanna 14", named "Aries", in scarlet red
1994 Kona Hahanna 14" codename 'Death Bike', currently ratty rusty royal blue, one day satin black + carbon
RESCUE HOME FOR:
Any 14" Kona Hahanna frame 1993-2000 + compatible parts...+ incompatible parts, I suppose..since I always tend to 'find a way'...oh well, just parts generally....WANTED: Propulsion/equilibrium tires, atm