sanding around corners question

[WillyC]

Anyone have any good tricks to sand corners and other tight areas. I will hopefully be painting the boat soon and need to finish up removing an old crappy paint job from the interior. Also, any good ideas on how to sand the recessed lines between the nonskid on the floor. I will be using the random orbital on the floor but will some how have to get those recessed lines in between. Thanks -will