I'm just waiting for Jeremy (WR14 2LL) to pop in with his retort to someone who suggested he'd missed a bit while cleaning one day. But I think he's on holiday at present.
Yes Tim, there's a definite advantage to Royal Ivory over the darker colours. When New Elms give mine a clean after servicing I always feel a bit guilty - it always comes home gleaming (except for last Friday when I got caught in a lot of rain!)...
Cheers,