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Vacuum and sweeping is by far the best way to keep your floor free of dust and debris. For heavier soiling that requires water either spot clean using a spray bottle and clean rag or mop using a dedicated stone & tile cleaner diluted into water. If you do mop try and mop as dry as possible as using lots of water will cause it to settle in the grout lines, evaporate away and leave dirt & grime behind. As porcelain floors do not get sealed we recommend considering a grout sealer for pale grouts or areas of heavy use such as kitchens, hallways & bathrooms. Application of a grout sealer will make ongoing maintenance and cleaning of a porcelain floor much easier. If you live in an area of hard-water do not be tempted to use limescale remover on natural stone as this will etch into the stone and there is no remedy for the damage this can cause.
There is no set frequency for resealing stone. Each installation experiences unique wear & tear so will age differently. Generally, as long as the floor was sealed adequately on installation and you have maintained it in the manner we recommend, then every 4-6 years would be realistic.
Stone is very hard wearing and unlikely to scratch. If it does scratch, these will eventually disappear into the patina of the floor. If you wear outside shows in the house then using a good quality mat is one of the best ways of protecting your stone floor. Using felt-pads or castors on furniture feet will also help and ensuring your vacuum head is not worn and ragged is definitely important. Do not drag furniture etc across stone floors, lift and place instead.
No, do not reseal. The stain should mellow in time but if it is a bad stain in a conspicuous place, then, as long as you know what caused the stain, there is usually a remedy.
Yes, acids such as wine, orange juice, vinegar, etc. and strong alkaline like urine will damage both the sealant and the stone - clean them immediately.