Perfectly clean. See Synonyms at clean. (adjective)
Free from blemish; impeccable. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "spotless" in a sentence
"If a soap powder is given a new additive that makes things glow, you call it "whiter than white" and link it to beaming kids in spotless England football shirts who later go on to become Michael Owen."
"The kitchen was in spotless order, and she sat down on a stiff-backed chair by the window to wait for her brother."
"Her little house was in spotless, speckless order from top to bottom."