Farmor15
Old fashioned yarn/string mop should do the job. Having tried all kinds of mops over the years, I've found them the best anyway. The base is only about 3in diameter and the strings get into small spaces. Best used with bucket with squeezy insert.
You can buy them with ribbon-like pieces of microfibre and a bucket.
They are the best types of mop, I find and I've tried so many different kinds!
This is Vileda, other similar makes available.
In fact, I'm going to order another one. Mine wore out and I've tried steam mops, squirty mops, ones where you place a washable pad on the end, you name it, I've tried it!