If it uses a combustion engine, you could try putting something hydrocarbon-soluble in the fuel, like polystyrene. Some of it will get past the fuel filter and foul up the carburetor (and probably the spark plug) without causing permanent damage to the engine. Removing the blockage is trivial, all you need to do is soak and rinse the parts in fresh gasoline, but the diagnosis and disassembly requires some effort and technical knowledge.


Take a look at Fiio’s wireless DACs. I use a BTR11 (costs like 25 EUR) and the quality is as good as I can reasonably expect at that price. Its output is a 3.5mm jack and it easily drives my 80-ohm Beyer.