Spray it with Brake Cleaner and wipe it with a Q-Tip. Then blow it dry with air.
The sum of p and q means (p+q). The difference of p and q means (p-q).
You would have to be more specific about what a Q restriction is. Restriction codes vary by state (here in North Carolina, they are numbered). However, to test for a passenger endorsement, a road test is required as well as a written test, even if you have a CDL already.
http://wiki.answers.com/Q/Can_you_use_compression_fitting_on_brake_line"
2 P in a Q=
"http://wiki.answers.com/Q/Where_is_the_brake_fluid_indicator_on_1998_Toyota_Sienna"
Q (queue)
The word "Q-tip" means "Quality tip".
http://wiki.answers.com/Q/How_do_you_change_rear_brake_pads_2004_gmc_2500"
use q wrench
http://wiki.answers.com/Q/How_do_you_intall_break_light_switch_for_2001_daewoo_nubira"
http://wiki.answers.com/Q/Adjust_emergency_brake_cable_on_2002_GMC_yukon"