not got it permaguarded no but i use zymol titanium on it. Really good polish, i'd of bought the one designed for red cars but this pot was from when i had my mini it's lasting ages!
after washing the whole car i use a squeege (i'm a signwriter so it's a tool of the trade)
but anything a little thicker than a credit card does the job wrapped with a cloth and push it inot the gaps of all the panels.
on another note zymol doesnt leave a white residue around panel gaps like most liquid polishes, and always use a microfiber cloth to remove it as other ones dont do a proper job