| Cleaning Line Ltd | Bradford | 2018 |
| Cleaning Machine Support Ltd | Leeds | 2016 |
| Cleaning Made Simple Limited | Cardiff | 2014 |
| Cleaning Manchester Ltd. | Manchester | 2013 |
| Cleaning Power Services Limited | Bradford | 2006 |
| Cleaning Services Kent Limited | London | 2024 |
| Cleaning Solutions Scotland Limited | Clydebank | 2020 |
| Cleaning Staff Ltd | London | 2025 |
| Cleaning Superstars Ltd | Hatch End | 2010 |
| Cleaning Technicians Limited | Suffolk | 1990 |
| Cleaning Wizards UK Limited | Norwich | 2008 |
| Cleaning Wonders Ltd | Crawley | 2016 |
| CLEANING2GO Limited | London | 2019 |
| Cleanique Limited | Deeside | 2023 |
| Cleanliness Club Ltd | Gordon | 2025 |
| Cleanmama Ltd | Cardiff | 2024 |
| Cleanme Service Ltd | Rugby | 2018 |
| Cleanmyclothes Group Ltd | Edinburgh | 2025 |
| Cleanmyplace Technologies Ltd | Cardiff | 2023 |
| Cleanparkuk Limited | Maidstone | 2016 |
| Cleanplusuk Ltd | London | 2017 |
| Cleans &Coats Limited | London | 2025 |
| Cleans 4 Less Ltd | Gateshead | 2019 |
| Cleansheen Limited | Bristol | 2008 |
| Cleanskye Limited | London | 2025 |
| Cleanspace (Commercial Cleaning Services) Ltd | Gosport | 2010 |
| Cleanspeed Limited | Wolverhampton | 2019 |
| Cleanstay Laundrette Durham Limited | Stanley | 2026 |
| Cleansy Cleaning Solutions Ltd | Bedford | 2021 |
| Cleantec (Midlands) Limited | Fareham | 2017 |
| Cleantec Equipment Ltd | Omagh | 2014 |
| Cleantech Energies Limited | London | 1995 |
| Cleantech Enterprises Ltd | London | 2012 |
| Cleantex CLE (Bristol) Ltd | Shaftesbury | 2017 |
| Cleantime Services Limited | Peterborough | 2006 |
| Cleantrace Limited | London | 1997 |
| Cleanup United Kingdom | Salisbury | 2007 |
| Cleanwalk Ltd | Bradford | 2025 |
| Cleanwash (Wembley) Limited | Harrow | 2019 |
| Cleanwave Drycleaners Ltd | London | 2018 |
| Cleanways Limited | Co Down | 1970 |
| Cleanzo 360 Ltd | Stockport | 2025 |
| Cleanzy UK Ltd | London | 2019 |
| Clear - Coalition for Liveable, Equitable & Accessible Roads Limited | London | 2025 |
| Clear Aesthetics by KP Ltd | Borehamwood | 2019 |
| Clear AID Training Ltd | Hemel Hempstead | 2025 |
| Clear and Clean Services Limited | Walsall | 1988 |
| Clear Aura Limited | Chichester | 2025 |
| Clear Beauty Limited | Chester | 2025 |
| Clear Blue Water Limited | Manchester | 2013 |
| Clear Bubble Solutions Ltd | Twickenham | 2019 |
| Clear Choice Hand Car Wash Ltd | Ipswich | 2024 |
| Clear Choice Home Improvements Limited | Lutterworth | 2004 |
| Clear Choice Laundry Ltd | Alexandria | 2026 |
| Clear Choice Windows & Maintenance Ltd | Grimsby | 2015 |
| Clear Complexions Ltd | Milton Keynes | 2023 |
| Clear Components Limited | London | 2020 |
| Clear Coordination Ltd | Colchester | 2017 |
| Clear Cosmetics International Ltd | Liverpool | 2024 |
| Clear Cremations Ltd | Harlow | 2025 |
| Clear CUT (Leigh) Ltd | Leigh | 2025 |
| Clear Cutz 2023 Ltd | Bradford | 2023 |
| Clear Cycle IT Limited | London | 2026 |
| Clear Dawn Comms and Media Ltd | Warrington | 2016 |
| Clear Drain SW Ltd | Stourport-On-Severn | 2022 |
| Clear Editorial Ltd | North Shields | 2012 |
| Clear Elite Limited | Manchester | 2024 |
| Clear Exit Limited | Glasgow | 2025 |
| Clear Financial Mortgage Services Limited | Newtownabbey | 2008 |
| Clear Find Limited | Manchester | 2025 |
| Clear Flow Leak Detection Limited | London | 2025 |
| Clear H2O Window Cleaning Services Limited | Basingstoke | 2012 |
| Clear Horizons Coaching Ltd | Cardiff | 2025 |
| Clear Inventories Ltd | London | 2015 |
| Clear Light Clinic Limited | | 2007 |
| Clear Links Holdings Limited | Waterlooville | 2019 |
| Clear Medical Limited | Manchester | 2016 |
| Clear Minds Dog Training Limited | Hereford | 2021 |
| Clear Mission Limited | Chelmsford | 2022 |
| Clear Optical Limited | London | 2014 |
| Clear Ovens Limited | Dunmow | 2010 |
| Clear Path Ahead Limited | Corby | 2024 |
| Clear PAY Contracts Limited | Basildon | 2018 |
| Clear Payment Limited | West Malling | 2022 |
| Clear Pixel Ltd | London | 2016 |
| Clear Property Solutions Limited | London | 2017 |
| Clear Recovery Limited | Ipswich | 2013 |
| Clear Reflections Coaching Limited | London | 2024 |
| Clear Route Immigration Ltd | Chadwell Heath | 2023 |
| Clear Saving Solutions Limited | Finchley | 2015 |
| Clear Scalps Ltd | Rainham | 2025 |
| Clear Shine Limited | Leeds | 2024 |
| Clear Skin Beauty Ltd | Bury St. Edmunds | 2021 |
| Clear Skin Clinic Bradford Ltd | Bradford | 2021 |
| Clear Skin Enhancements Ltd | Bury St. Edmunds | 2024 |
| Clear Sky Financial Services Ltd. | Glasgow | 2017 |
| Clear Sky Legal Services Ltd | Leicester | 2019 |
| Clear Sky Performance Ltd | Derby | 2017 |
| Clear Space Storage Limited | Yeovil | 2019 |
| Clear Standards & Associates Ltd | London | 2024 |