00-Is200-sport

Yes it’s only when it rains

Hi, I have recently bought a is200 sport sunroof model, there’s a major water leak, I cleared out the drains for the sunroof which were blocked and dried up the carpets the best I could but still to no avail, carpets front and back are drenched checked door and any other obvious areas that could leak without stripping off panels like windscreen etc, is there anyone that has came across something like this before or could point me in the right direction?