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In no particular order:
Scraper blade, heat gun, screwdriver, steel brush and a load of elbow grease.
I’ve been using this stuff which seems to be halting further rot:Then some of this after aluminium mesh and metal epoxy resin has been applied and dried
https://www.hammerite.co.uk/application/direct-to-rust/
Long term option = new sills and boot
What are you using to remove the underseal?
Oh and I recommend this stuff as a rust converter https://bilthamber.com/product/hydrate-80/ and then a cold galvanizing paint (high zinc content paint) or this https://bilthamber.com/product/epoxy-mastic/