Come in quick to catch some lights at a left turn yesterday, notice a line of water on the road so back off a little and avoid that. Lean into the turn and the front wheel starts to slide to my right. I'd left myself enough room to straighten up and recover so all was well. Was very disapointed as I'd just spent an hour working on my corners and had felt really good about my riding. Took the wind out of my sails a bit. Went past the same corner in my car this morning and worked out the line of water i'd 'avoided' was oil of some sort. I must have picked some up on the front tyre. Do I have to clean the tyre after contact with oil? If so what with? Silly question?