MADISON, Wis. » More states are requiring schools and government buildings to use environmentally friendly cleaning products, raising debate about their costs and benefits.

After a burst of legislation last year, 10 states, including Hawaii, Connecticut and New York, require or encourage “;green”; floor waxes, window cleaners and other products in schools, according to Green Seal Inc., a nonprofit that certifies the products. Similar bills are expected to be debated this year in at least five states.

Critics say that while the measures are laudable, states should not mandate which products schools and agencies must buy, especially if they increase costs for governments that are struggling financially.

But supporters say the laws protect the environment and reduce the use of harsh chemicals that can harm workers' and children's health.

“;The goal of the bill is to make schools and other public space less toxic and healthier for kids and the general public,”; said Democratic Rep. Cory Mason, sponsor of a bill in Wisconsin.

Nevada lawmakers watered down a bill last year that would have required green cleaning products in schools after school officials raised concerns about the cost and their lack of expertise in such cleaning. The bill signed by Republican Gov. Jim Gibbons only requires schools to use environmentally sensitive floor cleaners.

In Hawaii, Republican Gov. Linda Lingle last year vetoed a bill that would have required the Department of Education to give preference to products approved by Green Seal. She said it was inappropriate for the state to rely on certifications from “;a single private organization.”; The Democratic-controlled Legislature overrode the veto.

Mason's plan, like those in other states, would require public buildings in Wisconsin to use cleaning and paper products certified as environmentally sensitive by the federal government or several private groups. But it also would encourage agencies to apply the products in ways that reduce water use and the amount of chemicals released into the air.

The Assembly's natural resources committee voted 8-6 on Wednesday to approve the bill, which Republican critics said was unnecessary.

“;It's an overreach of the state in telling local schools what they should do to keep themselves clean,”; said Rep. Jim Ott, R-Mequon.

The vote sends the measure to the full Assembly for approval. Senate sponsors of the bill have said they plan to seek approval after the Assembly.

Green cleaning products are widely available at prices comparable to traditional products. In some cases, manufacturers receive green certifications for products they have long had on the market. After a rocky start years ago, their effectiveness also is now comparable.

But toilet paper, trash bags and paper towels made from recycled materials can still cost up to 20 percent more than traditional products, said Stephen Ashkin, executive director of the Green Cleaning Network in Bloomington, Ind.