Hi Mystyler,
With dirty fuel, it's not hard to just set it outside in an open tin, and set it alight.
Or if you want to reuse it for further cleaning, a cheapo paper vacuum cleaner bag will filter out the dirt - that's what I've used for years, on used parts cleaning fluids. My 'parts wash' trough is a cut down re-purposed home heating oil tank, with cut down legs, and a ball drain valve in the bottom. So it's easy to filter the used fluid as it drains out.
Back in the day, when we had petrol that had been used for parts cleaning to get rid of from the family OPE business, we'd just take it out to the local tip, when we took out the surplus mower cartons and shop/workshop rubbish.
The council back then didn't mind if you set cardboard rubbish alight. I can bear witness that a mower box full of petrol vapour goes up in a quite spectacular fireball!
BTW, a fast way to scrub rust off chromework is with a scrunched up piece of aluminium foil, dipped in water + detergent.
