NEW YORK (AP) _ Democrats Bill Clinton and Jerry Brown accused each other Saturday of offering ''sleaze'' to the voters and Mario Cuomo pleaded with them to lighten up on the final weekend of the New York primary campaign.

''This guy is becoming the prince of sleaze,'' Brown said in a name-calling fusillade aimed at Clinton while the Arkansas governor said Brown ''has viciously, personally attacked me since day one of this election.''

Clinton, elated after Cuomo said he would be a ''superb'' president, responded to Brown's broadside by saying a television spot his rival ran on a Buffalo station Friday ''is the sleaziest ad I think I have ever seen run by anybody, anywhere, anytime since I've been in politics.''

Clinton hopes on Tuesday to deliver a convincing enough blow to Brown in primaries here and in Wisconsin and Kansas to transform the former California into a marginal candidate.

Brown, trailing in the polls earlier this week, is trying to revitalize his campaign in New York and cast fresh doubt on Clinton's viability as a candidate for November's general election.

The importance of the New York contest is magnified by its rich cache of 244 delegates to the Democratic National Convention.

''Mr. Clinton, I think your nose is getting a little too long,'' Brown shouted to thousands of New Yorkers at a rally on Manhattan's Upper West Side. He complained Clinton ads aired on radio stations aimed at black listeners falsely accused him of opposing a hot lunch program for children.

Brown said that as governor of California he had actually increased funding for the lunch program but that launching the ads on the last weekend of the campaign gave him little time to respond.

''He's always smiling and saying don't attack ... then he unleashes a vicious attack,'' Brown said. He said called the ads ''absolute lies.''

Brown also lashed out at Clinton for questioning his commitment to abortion rights. Clinton aired briefly and then pulled Friday an ad that pointed to seeming discrepancies in comments from Brown on the abortion issue over the years.

Clinton aides said the ad was pulled because it might seem to be an attack not on Brown's position on the issue but on his private feelings on abortion.

But meeting with reporters outside a Harlem soul food restaurant, Brown claimed the ad showed that Clinton was ''becoming the prince of sleaze.''

''Clinton has no credibility,'' Brown said. ''Whether it's a moral flaw or just a continuing pattern of political deceit, it really does disqualify him as a serious candidate of our party, much less a president of our country.''

Referring to Clinton's negative ads, Brown said ''this guy is like Dick Nixon. He's got his own little black book and his gumshoe operation, trying to come up with little statements and dirt on anybody he can find.''

''We're not going to let some guy from an old-style, Arkansas political operation put one over on us and the people of New York.''

''This man runs a very dishonest campaign. He bellyaches about anything said about him, about his sleazy politics, his conflicts of interest, the way he exempts himself from the law of ethics that applies to everybody else, the way he gives political supporters and his friends the right to contaminate the rivers of Arkansas,'' Brown said.

Once criticized, Brown said, Clinton ''runs to Ron Brown and Jimmy Carter and the media,'' Brown said. Ron Brown is national Democratic chairman.

Clinton, Brown complained, was running the last-minute, weekend ads ''with a smile and the hypocrisy that only a man of his questionable character could even conceive of.''

In Albany, Cuomo urged the two candidates to clean up the campaign and temper the increasingly nasty tone. But his remarks were so favorable to Clinton and lukewarm to Brown that he all but abandoned his vow to stay neutral until after the primary.

''As a package, Bill Clinton will make in my opinion a superb president,'' Cuomo said. ''Jerry Brown, I will support if he is the candidate, given the alternative.''

Cuomo also dismissed the possibility that he could ultimately be the nominee if Democrats reject both current candidates and hold a brokered convention.

''Forget about it,'' Cuomo said. ''There will be no brokered convention.''