Nothing surpasses the feel of a properly applied oil finish. To keep your Sukop bass smooth and glowing, some basic steps must be taken. We'll look at some routine maintenance procedures along with some basic materials.
A bit of mineral spirits on a clean paper towel can be rubbed on the bass to remove dirt and grime. I'd suggest taking off all the strings as any fluid contacting them may affect their tone.
scratch & ding removal
Automotive type (black silicon carbide) sandpaper works wonders in this department. Sandpaper grit is measured in theoretical grains per square inch. 120 grit is about twice as coarse as 220 grit. The severity of the scratches or dings you're trying to address will dictate which grit to use. I'd say start with around 220 or 320 to be safe. If you want more material removed drop to 120-180. This can be done wet or dry. Wet sanding just means that you dip the paper in oil prior to sanding. Not only does it act as a lubricant but it also mixes with the material you're removing to create a fine suspension of oil and wood dust that fills open grained wood pores.
If any of the above steps are taken, allow at least 24 hours for any oil to dry before proceeding with 0000 steel wool (wool mixed with oil is a messy disaster!). Rub dry guitar with 0000 steel wool. Any rough areas can be dry sanded with 320-400 automotive paper and rubbed again with steel wool. Blow away all dust with compressed air. Dip two or three cotton balls slightly into the oil and apply in a circular motion. Remove all excess immediately with a clean paper towel. Allow 24 hours and repeat if desired. The old cabinet makers had a saying - oil once a day for a week, once a week for a month, once a month for a year, and once a year for eternity.