I have recently brought an IS200LE 2004 and found that the nearside boot well under the jack is full of water, I suspect that the culprit is the sunroof drain blocked or detached, is this a common problem and what is the best way to resolve it, anyone got any ideas, the water had been there for some time as a coat of rust residue had coated the painted parts, once the water issue is resolved I'll sort the rest