[wayne zabel]

How long would you dwell for when cleaning BW's?

Ive done about 10 in the past few weeks and commenced cleaning after doing the relevant checks needed.

Although all clients have been happy with the jobs I feel a better outcome would have been had with a longer dwell time.

Ive presprayed and seebo aggitated then extracted after only a couple of minutes as Im afraid of leaving the prespray longer and it getting into the backing.Is this what you would do or do any of you leave the usual 10 minutes of dwell time.

[craignozza]

I usually use spm or m power and leave to dwell for about fifteen minutes then extract and have never had any problems but to be honest i havnt done that many im sure there are guys on here who have done tons of them who can steer you in the right direction cheers craig

[markpowell]

Its polyprop so hit it with theUltrapac and leave 10 mins mate

[wynne jones]

Its polyprop so hit it with theUltrapac and leave 10 mins mate

Exactly, you can hit these hard. Powerburst, ultrapac or whatever then go set up your kit. What are you using that isn't giving you the result you hoped for?

[derek west]

echo above but not sure about the term "hit it hard" as this could be mistaken for put shed loads down, my personal way is stronger and less of is safer than week and more of.  mist on a strong product, agitate and leave as long as you like, just enough down to wet the fibres without running onto the backing.

test first though.

[wayne zabel]

Its polyprop so hit it with theUltrapac and leave 10 mins mate

Exactly, you can hit these hard. Powerburst, ultrapac or whatever then go set up your kit. What are you using that isn't giving you the result you hoped for?

Ive used Powerburst usually,but as i said not left on for a long dwell time and extracted after only a couple of minutes.

Ive been a bit reluctant to leave a long dwell so that the p/spray doesnt reach the backing.

[Shaun_Ashmore]

Polypropolene in the US is called Olefin and it's oil based or at least a biproduct so using a good grease cutter and one that suspends well, Ultrapak has a slight foam and suspends well, years ago in the Prochem magazine (not sure if they still do it) there was an article on the benefits on using Ultrapak on polyprop and its discharging of positive and negative charge.

Shaun

[Jim_77]

Shaun "The Scientist" Ashmore

Wayne, on your next one try this: Pre-spray lightly with a detergent-free product that doesn't need rinsing out.  Then, go straight over it with a rotary & bonnet.

After that, if the traffic lanes aren't 100% whack something stronger over them and bonnet them again, followed up by extraction with pressure down lower than normal and wand strokes a bit slower.

Doing it this way you may well risk a little moisture going down to the backing but only in the traffic lanes.  Remember the shrinkage has to happen all over the carpet to pull off the edges.  If it just pulls up in a narrower area the rest of the backing will take up the strain.

That's how I do it a lot of the time and get a great result without any problems.  Much quicker drying too

[Simon Gerrard]

I don't think there is the same problem with Belgian Wiltons that there once was, in that they don't tend to shrink with the newer generation.
The problem as I understand it is that BW is a synthetic pile fibre on a natural backing. So when you apply moisture, and the synthetic fibres being water repellent (unlike a wool fibre that will absorb its own weight in water) the moisture runs down the fibres into the backing causing shrinkage.
That's why dwell time isn't a great idea, neither imo is multiple cleans as has been suggested. I'd have thought a really good pre-vac and then a quick drying Encap product would do the trick.
In the past we have just turned these jobs away because if they do shrink you cannot stretch them back, so the risk (having to replace the carpet) outweighed the gain. Nowadays BW's tend not to be the problem they once were and we now clean them with a TM, no problem.

Simon

[Jamie Pearson]

Many of them now have polypropylene backings so don't present a problem unless you use really high temps which can cause them to stretch.

Quick backing check before starting.