Normallly i'd go for Bosch replacements, but a guy at work has just said that a mate of his works for a BMW Stealership and said not to bother with Bosch as that leave a Carbon Residue on your windscreen. Anybody else heard this ? I've had a quick Google Search but can't find anything. Apparently Valeo are good too but I wouldn't know where to get them from. What brand do they sell at Audi ?