It depends on the context and intended meaning.
"Clean maintenance" could be a valid phrase if it is referring to keeping something clean during maintenance work. However, in most cases, it would be more grammatically correct to say "maintaining cleanliness" or "cleaning during maintenance." Example: "The company has strict policies for clean maintenance of their equipment to ensure a safe and hygienic workplace."
7.39am BST Malaysia Airlines has released a statement saying the MH17 plane had a clean maintenance record.
"Running an airline during such an accident is terrible," he said at a press conference in Barcelona, adding that the Airbus 320 had been given a clean maintenance bill on Monday.
The aircraft, manufactured in 1997, had a clean maintenance record and its last check was on 11 July, Malaysia Airlines said.
Vice President of Malaysia Airlines Huib Gorter has told a press conference at Amsterdam's Schiphol Airport that Flight MH17 has a "clean maintenance record" and was on an approved route.
Earlier on Friday, Malaysia Airlines' senior vice-president Europe, Huib Gorter, said the plane involved had been in service since 1997, had a clean maintenance record and that all communications were functioning normally at the time.
The airlines has said that MH17 had a clean maintenance record, with its last maintenance check on July 11, according to accounts from a Malaysia Airlines news conference in Amsterdam. .
Photovoltaic (PV) generation systems (PGSs) have become an attractive option among renewable energy sources because they are clean, maintenance-free and environmental friendly.
They must also continue to refine turbine efficiency and design, improve spacing strategies and noise suppression, protect wildlife, and practice clean site maintenance and restoration when turbines are decommissioned.
Fix our infrastructure - bridges, roads, water treatment plants, ports (employ 2 million) * Create a National Environmental Corps for clean up, maintenance, and prevention of BP-like disasters.
The specific application here is the necessity for regular clean-up maintenance within the torus chamber of fusion reactors.
It's now cheap as well as being reliable, clean and low maintenance".
