You might find something useful in this lot...
http://www.google.co.uk/search?as_q...ny&as_dt=i&as_sitesearch=&as_rights=&safe=off
First thing I'd try is going over the marks with the pen that made them. Reapplying the solvent in this way takes the marks back up into solution and you can usually wipe the surface clean. Note, though, that this only works on hard, impermeable surfaces; with something permeable like your drum the pen will have penetrated the material and going over it again will only make the mark worse.
Was the pen solvent-based? Sniff it (carefully!) - if it smells strongly then it's probably solvent-based. If it doesn't smell much, chances the solvent is water or some other non-volatile liquid. If it's solvent-based, you could try rubbing alcohol, available from your local pharmacist. Or even something like tape head cleaner (for audio tapes or video cassettes), which is usually alcohol-based.
Trouble is, whatever solvent you use is likely to cause some damage to the underlying material - particularly that African drum. I guess it depends on how valuable the item is to you. As they say, "Try with caution on an unexposed area first".
Mineral oil on leather. A quick Google reveals a wide range of opinions - some swear by it, some at it. As a motorcyclist I treat my leathers with neats foot oil - although again, some folk reckon that's bad for leather, but after two decades I've never had any problem with it.
Do you know who made the drum? They might be your best bet for advice on care and maintenance. Or a shop that sells similar items, perhaps.
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