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For areas that are really dirty, Interior Shampoo can still be used, but I would recommend that this is in conjunction with a carpet extractor. Depending on the size of area that needs to be cleaned, I’ll either apply it directly to the area, or onto a brush as mentioned above. After a moderately strong agitation, I then go over the cleaned area with a carpet extractor. One thing that should be noted is that less is more when it comes to using a carpet extractor You can always do additional passes afterwards if it isn’t quite clean, rather than bombarding the area with product and oversaturating it. If not all of the liquid is removed, than it can lead to mould and dampness in the car. Results Our School of Car Care campaign aims to bring you the very best insight, advice and product guides to help you keep your car in tip top condition this winter. a>