Ok Guys, seeing as this debate has a large amount of Unconvinced Foam users I decided to do a test with the product and show you the difference between a good snow foam and just a jetwash.
The product is BH Autofoam , This is the best snow foam that I have ever used and has incredible results at only £17.00 per 4ltrs.
The recommended dilution ratio is 4% PIR (Panel Impact Rate)
to work out your impact rate fill your cannon with water.
next connect to a jet wash , turn the ratio adjuster on the lance to full (Clockwise)
Now empty the cannon via your JW into a bucket and measure the amount of water used.
My Total was 10trs + 1ltr in the cannon = 11ltrs x this by 4% = 440ml of product.
I only use 500mls of mixed solution on an entire Ford Transit, so mixed 220mls of product with 280mls of water in the cannon.
This is the van before any rinsing or foaming
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As you can see the doors are extremely soiled with road grime, Next I applied BH autofoam to 1 side of the van doors.
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The next picture is after approx 4mins of dwell time, you can now see the dirt running down the paint.
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Next up is to rinse the both doors with a PW leaving this result is on the untreated door.
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This is the other door that was treated with foam.
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Next to show how much soiling has been removed with just a PW, I used a white applicator to swab the panel for soiling, This is the untreated door
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And saving the best till last I took a swab of the treated door using a 2nd applicator pad.
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As you can clearly see, the difference between the treated and untreated side are noticeably different, If I were to have just PW'd the van with water, then washed it, I would still have a huge amount of soiling that would have been then transferred to mitt, and even using the 2BM I would still be more likely to create swirls and scratches.