It's up to you if you want to cut them off. If it is too unsightly to you, you can. But remember you are removing the plant's "photosenthesizers", so my personal take would be to only remove leaves if it is a small percentage of the overall plant, or if a leaf is completely overtaken, or if it looks like the infection is spreading.
I haven't used sulphur, so I can't give any experience with that. I have used Listerine and I have used a 3 in 1 product that has neem oil in it, both with good results. Although Listerine does leave a tacky sheen on the leaves, but better than an infection.
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