Try a 'scumball' or similar - oil will float on water so one of these absorbent do-hickies will catch the lamp oil. If it were only suntan lotion, or similar, you could reuse the 'scumball', but with volatile chems, it's better to 'use and dump' it
There's another post here on this - I'll go try to find it and link back here.
[EDIT] not that it's any different from what I previously said... here is the other link
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