They do this by quickly pulsating between on and off to result in rapid underhand bursts.
Time your sprinkler use so job overwater (overwatering can be as dangerous to your landscape as not watering enough). You can just scrub it with soap your current products want, then rinse this and dry it. https://www.hotfrog.com.au/company/7b93bf80b50317fcc2613872d8ada80a/the-grout-guy/norwest/ceramics-tile