I assume the drain is unclogged now? I def understand the concerns about the poison gas, but as long as you don't mix stuff then it's okay.

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The products I'd suggest, would be scrubbing bubbles mega shower foamer and some Melamine sponges (same thing as magic erasers) to tackle this job. I would also highly suggest picking up a pack of gloves too, so your hands don't get dried out or dirty!

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Scrubbing bubbles $4.88 USD : https://www.amazon.com/Scrubbing-Disinfecting-Multi-Surface-Bathroom-Rainshower/dp/B00GM5UH32/

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Melamine sponges $14.39 USD (for 50) https://www.amazon.com/Trendbox-Cleaning-Melamine-Multi-Functional-Bathroom/dp/B07WNNR4JB/

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Gloves $6.37 USD https://www.amazon.com/Mr-Clean-Reusable-Latex-Gloves/dp/B072B5K5KB/