My HD stores dont even ask to see a Lowes card.
The ones that dont give me the 5% also dont ask...they just outright say no, its for HD commercial card only.
And yes Ive asked for it on the clearance items
but I dont press the subject if they tell me no. One time (when I only had my temporary HD card) the cashier thought I had just signed up and gave me the first purchase 10% off after refusing the Lowes match. So technically I got the "first purchase discount" twice 
The ones that dont give me the 5% also dont ask...they just outright say no, its for HD commercial card only.
And yes Ive asked for it on the clearance items





