I do after they cure for a least a month . Some of them just get a buff with a piece of pantyhose . Others get a scrub with a toothbrush to get ash off .Some get wiped down with a damp soft cotton rag . Salt bars get a dunk and polished until they are super smooth , I dry them well with a towel and buff them .Some soap gets a rub with canola oil , then buffed with a towel . I just basically make sure it looks nice , no divots or dings or rough edges . ( I am a little on the anal side about how the soap looks) . It does make a difference in the finished look imho . Just play with a bar or two from different batches and see what you think.
Kitn