chemspec P.O.G ( paint oils grease remover )
works well , we use in in carpet cleaning to remove oils / grease stains, bubble gum etc
tho i often use it on upvc just wash off after with water and water fed brush ( keep it away from black rubber seals as you be wiping all day lol )
its a solvent , easy washed away - smells like pear drops .
not cheap but does last - does what it says on the tin.
link below.
http://www.cleansmartsupplies.co.uk/acatalog/Spot_and_Stain_Removers.htmlPOG (Chemspec)
Price: £8.76 (Excluding VAT at 20%)
Quantity:
Safely removes paint, oil grease, tar, shoe polish, ballpoint pen, marking ink, nail polish, oxidised oil and more. Emulsifiable solvent system - can be used diluted 4 to 1 with water. Rinse out after use with a quality alkaline detergent (eg Formula 90)or a volatile solvent (eg Wet Solvent).