Alcohol spots and watermarks can be removed with a cream metal polish (test on an inconspicuous area first), then faded areas can be disguised with ash or shoe polish; grease marks on unsealed wood can be sprinkled with good old talc, which you then cover with kitchen paper and press with a warm iron to absorb the grease; fill in small scratches with matching colored wax crayon or shoe polish.
Another option to remove stains is to slight rub back the timber with light grad sandpaper and then simple re varnish or oil your timber top.
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