Lighter fluid is good but expensive. [...] and Coleman fuel is down to a fiver a litre now so no excuse to burn petrol these days....
Well, Coleman Fuel is still four times the price of road fuel, and road fuel costs twice what it would cost without Road Fuel Duty:
http://www.petrolprices.com/the-price-of-fuel.html
So I reckon Coleman Fuel still costs about eight times the price of a reasonably priced hydrocarbon fuel. Even methanol is cheaper.
...[Aspen is pure, Panel wipe is pure]...
It might be pure, but pure what?
There are many different kinds of panel wipe, including some which are water based. At least the many different kinds of white spirit are more or less guaranteed to be hydrocarbon based.
The only way to know for sure what you're buying is to get the Material Safety Data Sheet (MSDS). In the UK at least, the law requires that it must be made available to you.
Panel wipe is for, er, wiping panels. Most panel wipe MSDSs will say that the product is only to be used as directed in the instructions, which will often stipulate forced air extraction and a maximum permissible concentration in the air breathed by the users. Most panel wipes will burn, but the combustion products might not be well known or they might even be dangerous. The instructions will not usually include instructions for burning. If you use any of these off-beat materials as a fuel, read the instructions and the MSDS and take extra care to have good ventilation.