Sulfur can cause nasty smells that could be responsible for asparagus wee wee.
If you are lucky enough to have on hand some of the great odor neutralizers that are on the market today, then follow the directions and repeat until your wee wee stain is gone.
Potty training pads, commonly known as Wee Wee Pads are a terrific product if you live in a high rise apartment and walking your dog isn't always feasable.
I always recommend a roomy crate, with a nice cushion or bed, and a lining of newspapers or wee wee pads.
Heard the urban legend about the man who got his wee wee stuck in--- you get the picture.