Bio Productions Premium Single Pass SP5 5 Ltr - Microsplitter Carpet Cleaner
Price: £13.30 (£15.96 Inc VAT)

Used this today on a dirty wool mix carpet. It didn't disappoint in any way. I mixed it 20:1 and pre-sprayed, agitated and rinsed. Perfect. Even good on filtration marks. Well worth a try and its going to make life much easier!!!