I have a 2000 A4 Avant (RHD) and water has started to build up in my right rear footwell and to a lesser extent in my right front (drivers) footwell. I thought I had fixed the problem but after some more heavy rain it's back.

I've searched already and have done the following:

- Checked all four sunroof drains. They all flow fine.
- Unblocked the two drain holes in the battery compartment. Originally there was some blockage.
- Checked that the housing/guttering for the aircon intake was correctly assembled. Originally the small gutter was partially blocked.

After I found more water today I re-checked all three and they're fine.

Can anyone suggest what I could have missed or other areas where I should look.