an effervescent tablet composition for use in cleaning toilet bowls . the tablet composition includes a surfactant and an effervescent system . the effervescent system may include an acid . further , the effervescent tablet may include a surfactant , binder , lubricant , and / or fragrance . a method of producing a toilet bowl cleaner is also presented , including mixing the starting materials , forming an effervescent tablet and , optionally , packaging the tablet in a moisture - resistant pouch .