Just bought a 2004 LS430 [82K miles] and intend injecting the doors with ACF-50 liquid to inhibit corrosion. To be repeated annually for this non garaged car in the UK.

I especially hope to reduce rusting where the two lateral 'chrome' strips are attached at top and further down the doors.

Would prefer not to remove door cards [something will go wrong] and have a long plastic tube with simple 360 nozzle working off an airless spray gun.

Any specific advice as to where to drill a 10mm hole for access?

The door cavity is filled with so much complexity would appreciate guidance to avoid damage drilling and inserting injector wand.

Perhaps someone is familiar with access to door sills and over wheel arch cavities?