Hi!
Every day after blowing the leadpipe and making slurring on the instrument between Eb up to C. I go downstairs from C to pedal C and than as low as i can, usually down to G# below the pedal C, and sometimes down to F. This routine loosen up all tensions. I do it frequently also after playing in the high register for a long time. I try to not change the lip/mpc position as well.
This works for me 🙂 but maybe not for all….