[M.Acorn]

I cleaned a beige wool mix carpet yesterday a cheap thin one 5 months old ish new build house they are using carpets that were discontinued about 8 or 9 years ago in all of them , after cleaning  i had a band of dark marks going all the way up the middle about 12 inch wide a series of about 7 or 8 lines almost like a bar code.The small bit of carpet in the lobby also had them but in a different direction.I assume this is some sort of manufacturing defect ?

[markpowell]

was the sub floor concrete or wooden floor boards?
Mark

[Mike Halliday]

if the ones in the lobby looked exactly like the ones in the other room I might say it was a design fault, but if it cleans off (and wasn't there when first laid) then perhaps it was a oily residue put on by the machine rollers when made, which has collected soil over time and is now showing it self.

Mike

[M.Acorn]

Sub floor was concrete the carpet was filthy and really badly worn for it`s age could see feint lines down it prior to cleaning that showed up darker when i pre sprayed.Did think it`s prob something to do with the rollers being dirty when made,have also seen some really badly laid carpet where the fitters had used a dirty kicker nightmare to get out.Did at 1 point think it was my hover but went over it with a damp wet towel and nothing came off.
And yeah had some trouble before with sucking dirt from between floor boards