Washer Fluid Light on all of the time

Any ideas on how to fix this. Ours has been on for about a year ('99 Villager Estate). No big deal as the pump works and it is obviously not low on fluid but it is getting soon to get rid of it and if I can get the light to go off that would be great.

I searched the forum and found a suggestion to bang on the reservoir or fish a coat hanger down but this was to no avail in helping.

Any other ideas or winning tips from others with the same problem??

Thanks.

I also have a 1999 Villager Estate with the exact same problem. If you find an answer, please let me know. Thanks!