There’s a fella named Steven Greydanus who comes on Catholic Answers Live sometimes and reviews movies.
A caller asked him about this, and he said he doesn’t recommend these services in general. He said they are not fool-proof, and that when they do work well, they normally destroy the movie.
My two-cents - if the movie isn’t appropriate, skip it. If you siblings are old enough to handle the movie and you are authorized to show it to them (not sure how old they are), then supervise, explain any iffy scenes, and trust.
Anyway - Greydanus has a website and there may be a link there to the movie scrubbing services. His site is www.decentfilms.com.
Great resource for figuring out just how “impure” a movie is.