[Jason Hedges]

Again depends on lots of factors, type of carpet, level of soiling, type of soiling, quality & type of pre-spray, dwell time, heat of rinse, pressure of rinse, rinse chemical (if any).

All the best,
Jason.

[Mike Halliday]

if pre-spray cooled as it passed through the air then how can we shower?...... wouldn't that be the same?...... as long as the jet in the sprayer allows a large droplet size it will be OK

and as for the pre-spray going cold on the carpet before it can have an effect drip hot water on your arm and see what happens before it has time to  cool.

[Neil Williams]

The water from a shower is a constant stream of high volume large diameter. You wouldn't put down that much prespray.
The sprayers we use produce much finer quantities and therefore with surface area will cool much quicker.
Try this test: Turn the temp up on your shower to high. With your shower running from a height of a couple of feet put you hand at ground level and feel the heat.
Now do the same thing with the same temperature in your sprayer....it will feel cooler yet the initial temperature starts off the same.

Or you could do the same test with a thermometer.

[Mike Halliday]

Neil I think your reasoning is flawed,

using a hydraforce which are normally fitted with a 06 jet you would spray from about 10inches from the floor, this not only is 4 times larger than the droplets from a shower they are also moving at a faster rate, the shower only looks more powerful as it is allowing a greater flow rate through it multiple holes.

its droplet size that hold the heat and it only has to pass through 10inched of air.

but this is all conjuncture and would make an interesting experiment for brainiacs on TV

[Russ Chadd]

I have the same setup as Colin and here are my thoughts:
The temperature of the water will effect the cleaning efficiantcy and again this seems to depend on the carpet / fabric and the chemicals used for pre spraying.
To give an example today I cleaned two filthy double sofas, tried M power, SPM... Agitation and left to dwell for 20 mins, still looked grubby after HWE.
Decided to use multi pro mixed with Solu boost and repeated the agitation... Rinsed with HW and this worked ok.
Then It was time for the grubby Berber... I had used all the diesel up on the sofas!!!
So it was a cold water rinse... SPM pre spray... Sebo duo... 20 mins and rinsed at 400 psi... Carpet cleaned up a treat.

[AshWhite]

Russ,
The best thing to have a van in these situations is:


































a spare can of diesel! 

[robert meldrum]

Surprised the cold water sinse got the diesel out 

[Russ Chadd]

So my point is ... by running out of diesel in my zeta i was forced to use cold water.
Using SPM which has been designed to be rinsed with either cold of hot water as a pre spray did a fantastic job!
To be fair though the berber carpet did not have any heavy grease or oil stains it was mainly traffic soil.

If hot water is available i will use it and yes... when it comes to pre spraying i want it to be as hot as possible.