now, now, lets not throw out our dummy's.
when i quote for a conny clean thats what i do clean it - custy is told is not restoration and that some ingrained dirt could possible remain.
they are charged accordingly to size/access etc..
restoring plastic is a totally different thing with the price in the hundreds - most people would not be prepared to shell
out that sort of dosh. ( in my experience )
however using TFR and WFP does remove 100% of crud in 7 out of 10 conny's and out of the other 3 whats left is usually small areas where the plastic is stained - usually the roof spines from pollution/lichen or from the rubber seals.
it all depends on what the customer wants and is willing to pay for.
Darran