[letzclean]

I have cleaned these office carpets did wet them too much but the backing has come through how can I rectify this was done a couple of days please advise much appreciated

[davep]

How did you clean them?

[david mitcham]

With a bucket of water by the look of it !!

[Mike Halliday]

Scrub in Prochems browning prescription .

Or use their oxibrite fibrebuff, foam shampoo combination , which you scrub in and let it do its work.

Treat it as a browning issue so an acid based treatment can help

[John Kelly]

That looks like wick back on carpet tiles. Probably the soiling load was so great due to lack of regular cleaning and correct vacuuming that it was impossible to remove all the dirty water so this has been drawn to the surface on drying.
Best option would be to bonnet clean it using a rotary machine. If you have to extract it then dry and get it dry before you leave using air movers.

One other problem it could be which would be irreversible, is that the tiles have Bitumen backing and a high solvent product has been used which has loosened the Bitumen.

[stuart_clark]

I would encap that with hydrox which is acidic and also has peroxide, but you can mix it up stronger say 4 to 1
maybe use a bonnet rather than a pad and leave to dwell before extracting
I had a similar problem this time last year, at a specsavers store in west yorkshire, carpet tiles were badly worn and there was evidence of bitchemus wick back, I used hydrox which eradicated the problem


Stuart