angles appearance building capping cleaning cover covered covering danger dangers ear protection edge exterior external height high high-pressure improvement maintenance pressure pressure-cleaning renovating renovation repairs restoration restoring risks risky roof roof-area roofing rooftop safety skies sky spray sunlight sunshine tiles tiling tools tough water wet work workman abstract background blended bubbles bubbling colors colourful colours decorative details distinctive edges edging effects foam foaming froth frothing frothy interconnected interlinked large Lather liquid merging mirroring multi-colored Multi-Coloured patterns perspectives reflections reflective rounded shape shapes small surface surfaces surfacing texture textured textures thick thin variations vibrant wallpaper backdrop beam bracket brown construction copy floor furniture grain graphic groove. grunge grungy hardwood hinge illustration industry iron knot knotted light mahogany maple material medium merchant natural oak panel pattern pine plank polish red redwood rough space stain stripe timber tree vector wall walnut wood wooden backgrounds barrel build connect drain gay gender group heavy industrial infrastructure liner materials metal metallic objects pile pink pipe pipeline pipes plant plumbing project queer repair round rust rusty sewer shabby site steel street technology tube tubing Underground used wear access-limited advice advising alert allocated allocation arrow authorised authorized automobiles behave black blue communicate communication denied directive emergency emergency-vehicles entry-denied entry-prohibited information informing limited limited-access no-access no-entry not-allowed not-permitted permission-denied prohibited prohibition restricted restriction restrictions sign vehicles warning white