yes, but the way they're made, you may as well replace the entire waste. Usually you take out the screw in the middle of the plughole first. The components are likely to be stuck in place wuth sealant or silicone, although a sealing washer is provided. The other part screws off from underneath.
Good-quality bathroom accessories are chrome-plated brass and are durable and non-rusting. Acid descalers can damage chrome. Bathroom cleaning sprays used per instructions are usually OK.
This is a good brand. Poor-quality imports are usually unbranded, or have a made-up name.
If the basin has an overflow moulded into the porcelain, you need a slotted waste. If the overflow is a flexible hose (like in a kitchen sink) you may need an unslotted waste or one with a banjo connector.
I've recently become enamoured of clicker wastes.
Don't get a pop-up as it will leak.