Hey harryray,
I bought my R3 in the spring of '16 and it's the one with the white top tube. After a couple of years it still is pretty white. When it gets dirty I'll give it a wash with some car wash solution and a sponge and it cleans up nicely. If there is some tough grease on it I'll use some Windex and that seems to take care of it. The white handlebar tape is another story....it's pretty grungy now and doesn't seem to clean up easily. I'll probably replace it this spring.
2016 R3 Ultegra Di2 61cm
1999 Litespeed Tuscany Ultegra 61cm