We use the basic fuel system cleaners (44k and 244) and the engine flush: 109.

They're good products, no doubt about it - especially the 109.

I'd be interested to know how people charge out for these products - as they're not the cheapest on the market.
At the moment, we try to sell them as a pair (fuel clean and engine clean together) as part of a service - but charged as extra's. We charge £32.75 + VAT for both. Our enthusiasm towards the product means a good few of our customers do opt for it. I just find it a slight pain 'selling' them and explaining the benefits to each customer...
How does everyone else 'sell' and invoice for the products?
Thanks!
Andy Fowkes