Hey Scattered,
Its a nice keris. It has a good sheath with nice pelet wood, a decent silver oversheath profusely repoussed with vegetation and animals. The hilt is of a good form, with well-carved patra. The mandak fits, and the blade looks late 19th century - mid 20th century. It has been recently re-washed, so it looks 'new'. You could have done a lot worse buying from some dealers elsewhere.
Anyway, your 1st keris is much better than my 1st keris, so appreciate and enjoy it!
There's always a 'better' keris of a 'cheaper' keris, just like there will always be a more beautiful person or a richer person. So how to we get settled down with that one special person who is neither the most beautiful, the smartest or the richest and still be happy? I guess its the same principle here.
At any rate, it does not need further cleaning. Do remember to oil it regularly, but remember to clean off all the oil you can before putting it back in the sheath; you don't want to end up staining the sheath with oil. Anyway, a keris blade cleaned with oil and blotted dry will stay rust-free longer than a blade with oil left on it. That tends to attract dust and the residual gunk when it dries promotes rust.
In short, you have a respectable keris.
Jeff - your keris may have a terrible sheath and hilt, but it has a beautiful blade. I think you might not have had such a bad deal. Just get it redressed in traditional sheath and hilt forms and you are going to have a very nice appropriate keris.