Possible Clues:

• Makes light of the material from coastline around port
• Play area, full of litter originally, now cleaner
• Cleaning agent
• Leading lady in seafront but it won't get her a tan
• Left in holiday location to tan? Just the reverse
• Make white
• Engineered cable height to lighten in the sun
• Laundry additive, sometimes
• Front of legs, covered up by seaside, go white
• Around fifty, strand gets to turn white