Removing transfers/stickers

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I've got an ugly old Mountain bike that I use for commuting, and amongst other ucly features it has some bright yellow letters that I'd really like to get rid of There's a limit to the level of ugly I can tolerate).The letters seem to be stickers, not transfers, as I can feel the thickness of them. They don't seem to be under any varnish.

So far Turpentine substitute has had no effect, and heating the letters with a hairdryer made one corner slightly melted after a good five minutes of heat, but it then took the paint off with it.

Any other ideas? I wondered about Nitro thinners, also sold here as lighter fuel. I really don't want to go all out and sand the whole frame off -yet- as this is supposed to be a backup that I can take to higher theft risk places, not a pet...
 
Wet it with water and (and if you have one) use a hair dryer to steam them off.
 
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