Rallye dash and wiper switch question

The wiper connection was truly simple to do and that CLR cleaning solution worked great. Cleaned up the old 2 speed switch great. Saved me much time and money. Can I use this cleaner on the bulkhead and fuse box connections? Can't think of why I couldn't, but I wanted to check first. The 72 harness I am using is in great shape but those two areas should be cleaner. Thanks.