Conservatory poly roof cleaning INSIDE the slats?

MONEYTREE_2

Somehow, dirt has got inside the two layers of polycarbonate. I just had a workman take a look and he says he has heard of the existence of extremely long thin brushes which one can slide in and clean the whole 6 foot length. However, he has no idea where he heard this from, thinks he may have dreamed it, and I cannot find anything on MSE.

I found what is perhaps a suitable brush on the net (up to 60") but this is in the USA.

http://www.justmanbrush.com/catalog/plugins/lineitems/browse.asp

Anyone know of a stockist in the UK?

firefox1956

Try this..................
https://www.youtube.com/watch?v=VBF0MQiLe5w
HTH