Ms Crenfeldt says she was unable to extract a DNA profile from the blood residue as it wasn't a good enough sample.
A 27-year-old, who can not be named, is on trial before a jury of seven women and five men in the High Court at Auckland this month.
Yesterday, the scientist said she was asked to examine an Adidas sports bag and a black suitcase found in a wardrobe that were of particular interest to police.
Earlier, ESR scientist Dianne Crenfeldt examined his apartment, where it's agreed Ms Millane died on the night of 1 to 2 December a year ago.
Those photographs taken in the early hours of December 2 2018 showed intimate photos of a woman's body, the detective said, which the Crown has alleged were taken of Ms Millane after her death.
The smaller of the stains was extra round and "might have come from a bucket", Ms Crenfeldt mentioned.
Millane, 21, was on a round-the-world trip when she disappeared on 2 December in New Zealand's largest city during a date.More news: Toyota and BYD join forces for EV development in China
Ms Crenfeldt couldn't determine how the blood had dripped but said it could been cast off from a body or fallen from a mop after being diluted with water. "The 70cm area may have been smaller and cleaned up and diluted to make it bigger", she said.
Ms Millane, a marketing graduate from Wickford, Essex, had visited South America, including Chile, Patagonia and Peru, before she disappeared after arriving in New Zealand in November a year ago.
She added: 'The shape of the probable blood staining and the presence of blood on the floor provided strong support that clean up of blood had occurred in this area'.
The footprints clearly showed someone had walked in blood with their left foot, the scientist said, and "transferred ... blood around the room".
BLOOD stains within the resort room the place Grace Millane was killed present that there had been a "clear up operation", a court docket heard at this time.
While there was no visible sign of blood on the top layer of the carpet, there was evidence of blood on the underside of the carpet, both sides of the underlay and the concrete floor below.
Ms Crenfeldt said the cleaning of the carpet could have decomposed DNA evidence.More news: West Indies clinch ODI series against Afghanistan
The jury along with her parents, David and Gillian watched the entire CCTV footage of December 11 starting from just before 6 pm till the last hours with the man who is accused of killing her.
They met at Sky City, before having cocktails at several bars in Auckland's CBD.
A forensic toxicologist has told the jury that at post mortem, the level of alcohol in Ms Millane's blood taken was twice the legal driving limit.
The 27-year-old man, whose name is suppressed by the court, appeared on trial Thursday in the murder of 22-year-old Grace Milllane, who was found dead in Auckland's bushland in December 2018, Metro UK reported.
The court heard Ms Ashcroft sent a number of short replies to Ms Millane, including "you have to go to his apartment in the hotel", "bet it's like the top floor" and "I love you too".
The trial continues on Monday and Justice Simon Moore reminded the jury not to engage with others about the case.More news: This will probably be baby Archie's first word