How to dedupe multiple linked fields without dedupe block

I’m a Plus member, so don’t have blocks, so don’t have the Dedupe block.
I have two linked fields, Brand and Model, and now that I’ve gotten to some scrubbing, have discovered that several of the models and brands are duplicated, or one is misspelled so listed separately. It’s pretty easy to change them one at a time, but in a couple, I have 10+ records under each of the duplicated models. Is there a way to dedupe or change a bunch of one field in a group of records without having the dedupe block?
Many thanks, Tim